Bergen County
Average 2002 NATA Modeled Air Concentrations
Compared to Health Benchmarks

Pollutant

Modeled
Air Concentration (ug/m3)

Health
Benchmark (ug/m3)

Risk
Ratio

%
Contribution from

Major Sources

Area
Sources

On-road
Mobile Sources

Nonroad
Mobile Sources

Background

Acetaldehyde

3

0.45

6

0.05%

5%

51%

10%

34%

Acrolein

0.16

0.020

8

0.3%

12%

67%

21%

0%

Arsenic Compounds

0.0006

0.00023

3

2%

17%

11%

8%

62%

Benzene

2

0.13

18

0.2%

11%

50%

16%

23%

1,3-Butadiene

0.2

0.033

5

1%

0.03%

52%

24%

23%

Cadmium Compounds

0.0001

0.00024

0.5

5%

57%

0%

1%

37%

Carbon Tetrachloride

0.6

0.067

9

0.0003%

0.3%

0%

0%

99.7%

Chloroform

0.2

0.043

5

0.2%

70%

0%

0%

30%

Chromium (hexavalent form)

0.0003

0.000083

3

38%

18%

8%

1%

35%

1,4-Dichlorobenzene

0.01

0.091

1.6

0.3%

68%

0%

0%

32%

1,3-Dichloropropene

0.02

0.25

0.8

0.00004%

100%

0%

0%

0%

Diesel Particulate Matter

2

0.0033

500

0%

0%

29%

71%

*

Ethylbenzene

0.8

0.40

2

1%

15%

59%

25%

0%

Ethylene Oxide

0.01

0.011

1

12%

22%

0%

0%

66%

Formaldehyde

3

0.077

33

0.3%

3%

33%

15%

49%

Methyl Chloride

1

0.56

2

0.02%

1%

0%

0%

99%

Methyl tert-butyl ether

4

3.8

1

0.2

12%

39%

49%

0%

Naphthalene

0.2

0.029

6

2%

60%

15%

3%

20%

PAH/POM

0.02

0.0075

2

3%

71%

16%

10%

0%

Perchloroethylene

0.3

0.17

1.9

1%

79%

0%

0%

20%

1,1,2-Trichloroethane

0.0000021

0.063

3.0E-5

36%

64%

0%

0%

0%

Chemicals with risk ratios greater than or equal to 1 are
in bold.
Risk Ratios in italics are based on noncarcinogenic effects.
The symbol ug/m3 is micrograms per cubic meter,
the amount (in micrograms) of a chemical in a cubic
meter of air. This is also known as a concentration.
* For diesel particulate matter, onroad and nonroad
concentrations include a model-estimated background
concentration.